But the giant banks are not only dangerous because they skew the political system. There are five economic arguments against the mega-banks as well.

Impaired Competition

Fortune pointed out last February that the only reason that smaller banks haven't been able to expand and thrive is that the too-big-to-fails have decreased competition:

Growth for the nation's smaller banks represents a reversal of trends from the last twenty years, when the biggest banks got much bigger and many of the smallest players were gobbled up or driven under...

As big banks struggle to find a way forward and rising loan losses threaten to punish poorly run banks of all sizes, smaller but well capitalized institutions have a long-awaited chance to expand.

The Bank for International Settlements (BIS) is often called the "central banks' central bank", as it coordinates transactions between central banks.

BIS points out in a new report that the bank rescue packages have transferred significant risks onto government balance sheets, which is reflected in the corresponding widening of sovereign credit default swaps:

The scope and magnitude of the bank rescue packages also meant that significant risks had been transferred onto government balance sheets. This was particularly apparent in the market for CDS referencing sovereigns involved either in large individual bank rescues or in broad-based support packages for the financial sector, including the United States. While such CDS were thinly traded prior to the announced rescue packages, spreads widened suddenly on increased demand for credit protection, while corresponding financial sector spreads tightened.

In other words, by assuming huge portions of the risk from banks trading in toxic derivatives, and by spending trillions that they don't have, central banks have put their countries at risk from default.

By failing to break up the giant banks, the government is guaranteeing that they will take crazily risky bets again and again and again.

We are no longer wealthy enough to keep bailing out the bloated banks. We have serious debt problems. See this, this and this.

(Anyone who claims that Chris Dodd's proposed "reform" legislation will prevent banks from getting bailed out again is wrong. If the giant banks aren't broken up now - when they are threatening to take down the world economy - they won't be broken up next time they become insolvent, either. And see this.)

Unfair Competition and Manipulation of Markets

Moreover, Richard Alford - former New York Fed economist, trading floor economist and strategist - recently showed that banks that get too big benefit from "information asymmetry" which disrupts the free market.

Nobel prize winning economist Joseph Stiglitz noted in September that giants like Goldman are using their size to manipulate the market:

"The main problem that Goldman raises is a question of size: 'too big to fail.' In some markets, they have a significant fraction of trades. Why is that important? They trade both on their proprietary desk and on behalf of customers. When you do that and you have a significant fraction of all trades, you have a lot of information."

Further, he says, "That raises the potential of conflicts of interest, problems of front-running, using that inside information for your proprietary desk. And that's why the Volcker report came out and said that we need to restrict the kinds of activity that these large institutions have. If you're going to trade on behalf of others, if you're going to be a commercial bank, you can't engage in certain kinds of risk-taking behavior."

The giants (especially Goldman Sachs) have also used high-frequency program trading which not only distorted the markets - making up more than 70% of stock trades - but which also let the program trading giants take a sneak peak at what the real (aka “human”) traders are buying and selling, and then trade on the insider information. See this, this, this, this and this. (This is frontrunning, which is illegal; but it is a lot bigger than garden variety frontrunning, because the program traders are not only trading based on inside knowledge of what their own clients are doing, they are also trading based on knowledge of what all other traders are doing).

Again, size matters. If a bunch of small banks did this, manipulation by numerous small players would tend to cancel each other out. But with a handful of giants doing it, it can manipulate the entire economy in ways which are not good for the American citizen.

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